Taper attachment for lathes



w. F. GROENE.

TAPER ATTACHMENT FOR LA'THES.

APPLICATION FILED JULY 6, I920-.

Patented Dec. 27, 1921.

3 SHEETFSHEET 1.

W F. GROENE. TAPER ATTACHMENT FOR LATHES APPLICATION FILED JULY 6.1920.

3 SHEETS-SHEET 2- Patented Dev. 27, 1921.

invent arr w. r: GHOENE.

TAPFR ATTACHMENT FOR LATHES. APPLICATION FILED'JULY 6.1920. 1,401,534. Patented Dec. 27,1921;

"UNITED STATES PATENTO F E WILLIAM r. Gunman, or cmciiman, x10, assmxoa TD run a x u. norm ,monnm TOOL contrary, or cmcnma'n, omo, a'conrona'rron or 01110.

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7 '0 all whom it may concern Be it known that I, WILLIA FQGnonNn,

a citizen of the United States and a resident of Cincinnati, county of Hamilton, and State of Ohio, have invented an Improvement in Taper Attachments for Lathes, of which the following 'descri tion, in connection with the accompanying rawings, is a specification,

like characters on the drawings represent in like parts.

is mvention relates to taper attachments for lathes whereby the lathe tool may be moved either toward or from the center of the lathe while at the same time it is moved toward an end of the lathe at a speed bearing a predetenninedrelation to its firstmentioned movement;

Taper attachments for lathes are used only i when it is desired to perform certain oper ations, and it is therefore desirable to construct the'taper attachment so that the lathe tool ma a, be very easily and quickly laced under t e controlof the same, and li ewise may be easily and quickly released from the taper attachment and the parts restored to .their normal operating condition.

Various forms of taper attachment for lathes have been heretofore suggested, two

different types being well known. In one of these types the cross feed screw is re-. leased from the cross slide during the use of the taper attachment so that the cross slide may be moved relative to its carriage by the taper attachment while thefcross feed screw is held from-a similar movement. In the other type the cross feed screw remains in a on the line 66 of operative engagement with thecross slide during'the'use of thetaper attachment, and

movement .is imparted to both the cross slide and feed screw by the taper attachment. The present invention relates more particularly to taper attachments of the latter type.

In the type of taper attachment last menguidebar which is held against movement relative to thelathe bed, and upon this bar is mounted a sliding shoe constructed to be a the taper atta slid along the gfliidebar during the use. of

the carriage alon the lathe 'bed. The slidling shoe usually ts tightly upon the. guide bar to prevent .play from occurring between these parts and after the bearin surfaces of dirty, 'due par y to the infrequent use of the taper at-- the ide bar become dry an ment-by the movement of- Speeifleation of Letters Patent. P t t d D '27 Application filed July 8, 1920. a Serial No. 894,089.

tachment, considerable force is required to slide the shoe alon its guide bar.

One important eature of the present in- Y ve'ntion, therefore, is to provide im roved means very simple in construction or. impartin the movement of the carriage along its be to the sliding shoe.

Anotherimportant feature of the inven-' tion is to provide means for relieving the cross feed screw from all lateral and lengitudlnal stressesduring the use of the taper attachment.

Still another feature of the invention is to a 10 a under the controlof the mechanism and retrue scope thereof, as defined by the claims.

In the drawings view taken through a lathe bed and its carria p p Y ig 2 is an enlarged plan view of a portionof the lathe bed having the taper at-- tachment secured thereto;

Fig.3' is a rear elevation of the parts shown in Fig. 2; a

Fig.4 is a fragmentary plan view of the portion of the crossslide to which the feed screw nut is secured; a Fig. 5 is a vertical sectional view taken substantially on the line 55 of Fig. 4;

Fig. 6 is an enlargedsectional view taken ig. 21; and a Fig. 7 is an enlar ed on the line 7-7 of F i The lathe bed 10 may be of any1 preferred construction and upon t usual or e same is 'slidably mounted the usual carriage 11 car y r ing the cross slide 12- to which is secured .tioned it is customary to provide' a taper Figure 1 is a vertical transverse sectional sectional View taken t e usual tool suppo rtin mechanism 13. v

The cross slide.12 is pr'ovi ed with the usual cross feed screw 14 the forward end of which is slidably received in the cross-feed c bush 15 and is secured thereto by a spline or ke 16. The -cross feed screw 14 has threa ed en gement with a nut 17 rigidly securedxto t e lower face of the cross slide 12 by any suitable means such as. a stud 18 35' securing the draw-bar 28 to the sliding shoe taper attachmentv guide bar 22, the same being pivotally secured to the face 21 intermediate its end by a ivot pin 23 and the 4 I guide bar 22 maybe adiusted about its pivot 5 in 23 to the desired angleby the set-overob 24, after which itmay be clamped in place by-the bolts 25. Upon theguide bar 22 is slidably mounted a shoe 26 provided with a key 27 for takingup wear.

The lathe mechanism so far described is old and well known and need not be described hereinin further detail.

3 The means for operatively connecting the shoe26-to the cross slide 12 in such a man- 15' ner that the cross feed screw will be relieved from both lateral and longitudinal stresses,

, will now be described. Adjacent the screw 14 and parallel thereto is mounted a'draw bar 28; this bar is sufiiciently large in cross section to withstand all strains to which it may besubmitted, and one end of this bar in the present instance of the invention is slidabl received in an aperture formed throu the cross-feednut 17. The other end o the draw bar 28 is slidably supported in a bearin 29 ,formed in an outboard bracket 30. he bracket 30 has its ends 31 rigidly secured to the lathecarrlage 11 and is supported a slight distance abovethe shoe so 26 to clear the same. The portion of'this bracket in which the bearin 29 is formed 'lies to the rear of the guide ar 22, as will 26, an it is' also desirable that the feed .screw 14 be secured to the draw bar 28 to prevent relative longitudinal movementbetween the-same and eed screw. To this end the raw bar has rigidly secured thereto, intermediate its ends a bearingblock 32. This bearing block," in the presentembodim'ent of the invention, has an aperture formed therethrough throu h which the draw bar extends, and the glockisrigidly secured to the bar by a pin 33.. The bearing block 32has a a second aperture formed therethrough which is 'rotatably mounted'an end 34 of the feed screw, and the feed screw is provided 60' with thrust collars 35 to prevent the same from; moving longitudinally within the bear- 5 1ng",block. The bear-in block is conveniently secured to the sliding shoe26, when it a is desired to use the taper.attachment,-by a '55 clamping stud or bolt 36 which extends through an a erture in the bearing block and has threa ed enga ment.with theshoe 26/ The arrangement I ust described is such that when the bearing lock and shoe are Se cured together by the bolt 36 any movement oi the s cc toward or.from the carriage 11 will be parted to the draw b'ar'28 and screw 14.- I I As the carriage -11 is' moved along the at 1am bed, this movement will be'imparted to the shoe 26b the bar 28 when the bolt 36 is in place, an since the bar 28 is relatively large and is supported to one side of the shoe 26 b the bearing 29, and, if desired, is supporte upon the opposite side of the shoe by the b'earm 37, in the carriage, the feed screw 14 is re ieved from all lateral strains.

- In order to relieve the feed Screw from Ion-- necessary is to tighten u the nut upon the threaded stem 39 of t e yoke, and this clamps the bar against a wall of the aperture in the nut 17 in an obvious manner.

When it is not desired to use the taper attachment, the bolt 36'is removed to release the shoe 26 from the carriage 11, but when the bolt 36 is removed it is necessary to profrom moving in a lengthwise direction; to this end thei'draw bar 28 may be rigidly clamped in the bearing 29 by embodiment of the invention illustrated, by providing the bolt 40 with a sleeve 41 (see sitioned to be forced into clamping engagement'with the draw the bolt 40..

From the foregoin in connection with the drawings, it will be seen that if it is. desired to use the taper attachmen't, all that is necessary is-to adjust the guide bar 22 to the desired angle, release the clamping bolt 40 and insert t e bolt 36 the bolt 40. This is satisfactorily accomplished in the Fig. 7) slidabl mounted in the bearing 29. an this sleeve: as a cut-away portion 42.po-'

description, when read vide means to prevent the cross screw 14 bar 28 by tightening I to secure the draw bar 28 to the shoe 26, and a while the partsare in this position the feed screw 14 may be rotated by the hand wheel 43 to adjust the tool toward the work, after which the crossslide 12 may be clamped to the draw bar by tighteningup the nut upon thebolt 39- Y When it is no longer desired to use the taper attachment, all that is necessary is to remove the bolt 36, loosen the nut upon the bolt 39 and tighten. up the bolt 40.

Claims 1. In a -taper attachment for lathes, the combination of a lathe carriage having a cross .slide mounted thereupon, a feed screw operatively secured to thecross slide, a draw bar mounted adjacent the feed screw and slidably supported by the carriage, a bearing block carriedb and, rigidly secured to the draw bar,"said lock having the feed screw rot'atably mounted therein the feed screw being held against movement bodily relative Q cross slide mounted thereu a in the feed screw being he d a inst moveclamping to the block, a taper guide bar provided with a sliding shoe, and means for securing said a block to said shoe.

-2.In a taper attachment for lathes, the combination of a lathe carriage having a slide mounted thereupon, a feed screw operativel secured to the cross slide, a draw bar slida 1y mounted adjacent the feed screw, a connection between the draw bar and. feed screw for reventing relative bodily movement of the rew bar and feed screw,

a taper guide bar having a slidin shoe,

means for securing the draw bar to t e shoe idly secured'tot e draw bar, said blockhaving the feedscrew rotatabl mounted therement bodily relative to the bloc a support for the outer end of the draw bar, means for the draw bar to said an port, a taper guide bar provided with a slidm shoe, and means forpivotally securing sai block and shoe together. a.

4. In a taper attachment for lathes, the

combination of a lathe carriage having a cross slide mounted thereupon; a feed screw operatively secured to the cross slide, a draw bar adjacent the feed screw and slidably supported by the carriage, a connection between the draw bar and feed screw for preventing relative bodily movement of the draw barand-feed screw, a ta r guidebar a screw tothe cross sli having a. sliding shoe, means or removably securing the draw bar to the shoe to impart movement of the latterto the former, and

means for clamping. the draw bar against movement relative to the cross slide.

5. In a taper-attachment for lathes, the

combinationof alathe carriage having a cross slide mounted thereupon, a feed screw, a cross nut for o ratively securing said mounted in saidcross feed nut and eaten ing rearwardl? "beyond -'"the cross slide, a bearing slidab b the draw bar means for-clamping thedrawbar within and bearing, a bearing block carried by and rigidly secured to the draw bar,

, cross slide mounted thereu end of the draw bar, means for clamping the a draw bar. slidably supporting the rear end: of. movement therebetween;

said block having the feed'screw rotatably mounted therein the feed screw being held a 'nst movement bodily relative to the b ock, a taper ide bar provided with a sliding shoe, an means for pivotally securing said block and shoe together.

6. In a taper attachment for lathes, the combination of "a lathe carriage having a n, a feed screw, a cross feed nut for o ratively securin said screw to the cross slid; a draw bar sli abl mounte'din said cross feed nut and extend ing rearwardly, a bearing slidably supporting the rear end of the draw bar, means for clamping the draw bar within said bearing,

a bearing block carried b and rigidly secured to the draw bar, sai block having the feed screw rotatably mounted therein the feed screw being held against movement bodily relative to the block, a taper guide bar provided with a sliding shoe, and means said shoe.

7. In a taper attachment for lathes, the combination of a lathe carriage having a cross slide mounted thereupon,-a feed screw, a cross feed nut -for operatively securing said screw to the cross slide, a draw bar slidably mounted adjacent the feed screw and extending rearwardly, a support for the rear draw bar against movement relative to the cross slide, a bearing block carried by and rigidly secured to the draw bar said block having the feed screw rotatably mounted therein, the feed screw being held against movement bodily relative thereto, a taper guide bar provided with a sliding shoe, and means for pivotally fastening said block and shoe together. a 8. In a taper attachment for lathes, the combination of a lathe carriage having a cross slide mounted thereupon, a feed screw operatively secured to the cross slide, a taper ide bar rovided with a slidin shoe, a raw bar slidably supported by sai carria e and adapted to 1m art the movementvof t e carriage to said sli ing shoe, abearingblock ri 'dly secured to the draw barand removabd y secured to the sliding shoe, means for removably clamping the draw bar to the cross slide to im art the angular movement of the sliding 8 0e to the cross slide, and means for securing said feed screw to saidv bearing block to "prevent-:relative= bodily In testimony whereof I have si a name to this specification.

' WILLIAM F. GROENE.

for removably fastening draw bar to t 

